Materials Literature
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Arjunolic acid, a functionally rich chiral triterpenoid with a rigid pentacyclic backbone, has the potential to be used as a structural framework for the design of molecular receptors and supramolecular architectures. The design and synthesis of the first arjunolic acid-derived 18-crown-6 and its binding studies with…
Abstract Stable virgin olive oil‐in‐water emulsions were prepared using total endogenous surface‐active components derived from oil as emulsifying agents, and the interfacial properties of the emulsion droplets were examined. The amount of oil extracted into the aqueous buffer increased with buffer pH, with the most s…
An expression for the description of the frequency-dependent magnetoelectric response in hybrid magnetostrictive-piezoelectric multiferroic composites is presented by using constitutive and motion equations. The calculations show that the values of the magnetoelectric voltage coefficient of the composites in the regio…
Several mixtures of hexanethiolate capped gold nanoparticles and discotic liquid crystals were prepared. The thermophysical properties of these mixtures were investigated using polarizing optical microscopy, differential scanning calorimetry and DC conductivity. Formation of columnar mesophase and about 250 times enha…
Temperature- and electric (E)-field-dependent domain structures and phase transformations in a (001)-cut Pb(Mg1∕3Nb2∕3)0.6Ti0.4O3 (PMNT40%) single crystal have been investigated by polarizing microscopy and dielectric permittivity. The unpoled crystal has tetragonal phase domains (15–60μm wide) with polarizations alon…
Meso(3- and 4-pyridyl)porphyrins coordinated to four [Ru(bipy)2Cl]+ complexes, M(3-TRPyP) or M(4-TRPyP), where M=2H+ and Zn2+, have been obtained and characterized by electrochemistry, spectroscopy and mass spectrometry. Layer-by-layer electrostatic assembled films with tetrasulfonated phthalocyaninatecuprate(II) anio…
We report the synthesis of a highly loaded and thermally stable Cu-containing mesoporous silica, which was developed by making use of poly(acrylic acid) (Pac) assembled with surfactant (C(16)TAB), as template. On this backbone, TEOS and Cu(II) hydrolysis takes place leading to the development of the final mesostructur…
The importance of singlet oxygen mechanism in photooxidation of phthalocyanine chromophore has been studied for promising singlet oxygen sensitizers: metal-free tetra-tert-butyl phthalocyanine and its Zn , Mg or Al complexes. It has been found that involvement of singlet oxygen in phthalocyanine photodegradation is de…
Abstract The sulfur‐rich ligand C 12 H 12 O 4 S 6 ( 1 ) and complexes [(C 12 H 12 O 4 S 6 )CuI] 2 ( 2 ) and [(C 7 H 6 O 4 S 3 )CuI] ∞ ( 3 ) have been synthesized and characterized crystallographically. Molecules of compound 1, a tetrathiafulvalene (TTF) derivative, have a boat‐shaped configuration and are packed discr…
In this paper, we describe the effect of electron-beam (EB) curing on ultra-low- k dielectric porous SiOC material ( k =2.2) and the application of this technology to the 90-nm-node Cu/low- k multilevel damascene process. A significant improvement of dielectric porous SiOC films with EB curing has been demonstrated. T…
On the route to alumina, oxygen-rich oxides such as Al(O2)3 (see picture) are detected spectroscopically during the stepwise oxidation of aluminum atoms and confirmed structurally by quantum-chemical calculations.
A thermostable glucose dehydrogenase (GlcDH) mutant of Bacillus megaterium IWG3 harboring the Q252L substitution (Y. Makino, S. Negoro, I. Urabe, and H. Okada, J. Biol. Chem. 264:6381-6385, 1989) is stable at pH values above 9, but only in the presence of 2 M NaCl. Another GlcDH mutant exhibiting increased stability a…
Six-membered ferric wheels [Fe6Cl6(L2)6] were generated from the corresponding N-alkylsubstituted diethanolamines (H2L2) {L2 = [®-N(CH2CH2O)2]2−; ® = Me-[CH2-]17 (3d); Me-[CH2-]19 (3e)}, calcium hydride and iron(III) chloride. Compound 3d was characterized by X-ray crystal structure analysis. The lipophilic tails of 3…
As mudanças mineralógicas de solos cultivados e submetidos à fertilização potássica ainda são pouco conhecidas em regiões de clima subtropical úmido. Para que estas sejam avaliadas, amostras de solo foram coletadas, na profundidade de 0-10 cm, em um experimento realizado desde 1991 no campo experimental do Departament…
Surface engineering is a critical effort in defining substrates for cell culture and tissue engineering. In this context, multilayer self-assembly is an attractive method for creating novel composites with specialized chemical and physical properties that is currently drawing attention for potential application in thi…
Abstract Novel nonplanar fluorescent dyes, 2,3-dicyano-7-methyl-6H-1,4-diazepines, were synthesized. The fluorescence intensity of 6-substituted 2,3-dicyano-5-[4-(diethylamino)styryl]-7-methyl-6H-1,4-diazepines in vapor-deposited film was on the order of the substituent at the 6-position: n-Bu, Et > t-Bu, H. Th…
An in situ electrochemical electron spin resonance (ESR) study on the electro-oxidation of para-chloroaniline, para-bromoaniline, and para-iodoaniline dissolved in acetonitrile at gold electrodes is reported. ESR spectra obtained using a tubular flow cell reveal the presence of a paramagnetic dimer product derived fro…
The mechanism of the Yb3+-->Er3+(PbO-Bi2O3-Ga2O3) glasses by use of several combinations of Yb3+ and Er3+ concentrations. The measured luminescence decay curves of the donors are used to determine the experimental transfer rates; the best fittings for them are obtained with single exponentials. The microparameters…
An atomistic model of layered double hydroxides, an important class of nanoporous materials, is presented. These materials have wide applications, ranging from adsorbents for gases and liquid ions to nanoporous membranes and catalysts. They consist of two types of metallic cations that are accommodated by a close-pack…
In order to scale-up high-performance YBa/sub 2/Cu/sub 3/O/sub 7-/spl delta// (YBCO) coated conductors, we have been investigating pulsed laser deposition (PLD) of YBCO on the "self-epitaxial" PLD-CeO/sub 2/ layer on an ion-beam-assisted deposition (IBAD)-Gd/sub 2/Zr/sub 2/O/sub 7/ (GZO) buffered Hastelloy tape. Our c…